pcre_xclass.c

/************************************************** Perl-Compatible Regular Expressions **************************************************//* PCRE is a library of functions to support regular expressions whose syntaxand semantics are as close as possible to those of the Perl 5 language. Written by Philip Hazel Copyright (c) 1997-2005 University of Cambridge-----------------------------------------------------------------------------Redistribution and use in source and binary forms, with or withoutmodification, are permitted provided that the following conditions are met: * Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. * Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution. * Neither the name of the University of Cambridge nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THEIMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSEARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BELIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, ORCONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OFSUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESSINTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER INCONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THEPOSSIBILITY OF SUCH DAMAGE.-----------------------------------------------------------------------------*//* This module contains an internal function that is used to match an extendedclass (one that contains characters whose values are > 255). It is used by bothpcre_exec() and pcre_def_exec(). */#include "pcre_internal.h"/************************************************** Match character against an XCLASS **************************************************//* This function is called to match a character against an extended class thatmight contain values > 255.Arguments: c the character data points to the flag byte of the XCLASS dataReturns: TRUE if character matches, else FALSE*/
PCRE_EXPORT BOOL
_pcre_xclass(int c, const uschar *data)
{
int t;
BOOL negated = (*data & XCL_NOT) != 0;
/* Character values < 256 are matched against a bitmap, if one is present. Ifnot, we still carry on, because there may be ranges that start below 256 in theadditional data. */if (c < 256)
{
if ((*data & XCL_MAP) != 0 && (data[1 + c/8] & (1 << (c&7))) != 0)
return !negated; /* char found */
}
/* First skip the bit map if present. Then match against the list of Unicodeproperties or large chars or ranges that end with a large char. We won't everencounter XCL_PROP or XCL_NOTPROP when UCP support is not compiled. */if ((*data++ & XCL_MAP) != 0) data += 32;
while ((t = *data++) != XCL_END)
{
int x, y;
if (t == XCL_SINGLE)
{
GETCHARINC(x, data);
if (c == x) return !negated;
}
elseif (t == XCL_RANGE)
{
GETCHARINC(x, data);
GETCHARINC(y, data);
if (c >= x && c <= y) return !negated;
}
#ifdef SUPPORT_UCPelse/* XCL_PROP & XCL_NOTPROP */
{
int chartype, othercase;
int rqdtype = *data++;
int category = _pcre_ucp_findchar(c, &chartype, &othercase);
if (rqdtype >= 128)
{
if ((rqdtype - 128 == category) == (t == XCL_PROP)) return !negated;
}
else
{
if ((rqdtype == chartype) == (t == XCL_PROP)) return !negated;
}
}
#endif /* SUPPORT_UCP */
}
return negated; /* char did not match */
}
/* End of pcre_xclass.c */